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RobotWebTools / ros2-web-bridge

Bridging your browser to the ROS 2.0
Apache License 2.0
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Not possible to connect to RosBridge #185

Closed GitRepJo closed 3 years ago

GitRepJo commented 3 years ago

Hi,

I installed the current version of node v10.19.0. on Ubuntu 20.04.2 LTS I run node bin/rosbridge.jsand node examples/index.js However when i open http://localhost:3001/html/publisher.html in the browser i get the message.

Error in the backend! Connection closed.

No messages are received by the node index.js.

I changed the port of the node index.js to 3001 in index.js because 3000 was already used.

Any suggestions on how to narrow down on the error or get a more detailed error description?

GitRepJo commented 3 years ago

As already stated in #160 https://github.com/RobotWebTools/ros2-web-bridge/issues/160, DEBUG=ros2-web-bridge* node bin/rosbridge.js provides more details. It turns out, that the default port localhost:9090 was already blocked. Changing it to an open port worked well. I checked for blocked ports with sudo nmap -sT -O localhost